TONG is Tetris and Pong in the same place at the same time!
Latest is v1.2, available here: http://nongnu.org/tong/tong-wii.zip
TONG for Wii is played with the Wii remote held sideways (NES-style). Manipulate the tetrads as usual with +, 1 and 2, tilt the controller to move the paddles.
All sources and assets are GPL3. Code and other versions available at: http://nongnu.org/tong/